Fluid fuel control device for multiple burners



May 30, 1950 v. J. EVANS FLUID FUEL CONTROL DEVICE FOR MULTIPLE BURNERS Filed Jan. 11, 1946 2 Sheets-Sheet 1 INVENTOR.

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FLUID FUEL CONTROL DEVICE FOR MULTIPLE BURNERS Filed Jan. 11, 1946 2 Sheets-Sheet 2 IN V EN TOR.

Patented May 30, 1950 :0 N1 TED moss PATENT OFFICE FLUID; FUEL CONTROL DEVICE FOR 'MULTIPLE BURNERS "Vincent "JgEvans; f Lakewood, 011110,: assignor -to -Grand Industries, 1110., Cleveland, Ohio, a corporation of Ohio Application January 11, 1946,- Sorial'Non 640,561

(Cld236-15) This invention relatesto a fluid .fuel control .device and particularly to a device for controlling the flower-fuel to a plurality of burners.

One of the principal objects of the present invention is to provide a fluid fuel control'device for aplurality of burners in which a single ther- .mostatically operated valve controls the flow of 'fuel to all of said'burners.

Another object is to provide a'fluid fuel control device for a..plurality of burners and which operates for admitting fuel successively to the burners as the device is operated and in which a-single thermostatically operated .valve. controls theflowof fuel to allof theburners after fuel has been admitted tothe last burner.

A more specific object is to.provide a low heat burner and high heatburner controlled by a single step cock and thermostatic valve combination such that, uponrotation of the stop cock in .theppening.direction, fuel is. admitted first to the lowheat burner, and then to the high heat burner for effecting concurrent operation thereof with the low heat burner, and a single thermostatic .valve .is set by the rotation of the stopcock in theopening,direction and thereafter controls the operation of bothburners.

Another specific operation is tOP YOVide a stop coclaend thermostatic valve combination for the purposes described which is compact and simple in construction and adaptedfor usein gasranges and heaters such as are generally available on the market.

Another object is to providean oven with a burner and burner controllby which 'BffiCiBIlt heat control in the ovenis obtained.

Another object is to provide amultiplefburner and control combination by which the properco- .operative relation of the'burners is effectedby the setting of a'single rotatable dial.

Other objects and advantages will become apparent from the following description wherein .reierenceiis made to the drawings, in which Fig. 1 is a schematic View of a control and burner combination embodying the principles. of

the present invention, thecontrol device and a portion of the burner being shown in section for clearness in illustration;

Figs. 2 and 3 are cross sectional views taken on the lines 2-2 audit-3, respectively, of Figzl;

Fig. 4 is a fragmentary side elevation of an oven with the control and burner combination installed herein, thefragment of the oven being shown in section.

For the purposes of illustration, the. present invention is shown for controlling the supply of generally at :I It.

gaseousjfuel toa clualburnerfor an oven of. a cooking ran fi its'use in connection with asingle burner or a pluralitypf separateburners employing gas 'or other typesof fluid fuel; and 'for heating other compartmentsbeing readily apparent "from the illustrative example.

As illustrated in the drawings, the dualburner to which fuel is tobe suppliedunder controlis shown as comprising a low heat burner I having a mixingbell't and aghigh heatburnertl having a mixing bell l. "In theyform-illustrated,the dual burner is cast as asinglepiece, a suitablepartition wall fisegregating the .two burnersfirom each other internally, Gas 'is supplied to "the burner! through the usualthrottling injection nozzles t3 and to theburner 3 through the throt 'tiing injection nozzle the orificesjt; and? pi-e1? erably being of ttheneedlevalve control-type.

.Gasis suppliedtothe orifices E and I through theflocal supply lines 3 and*9,;respectively, and

a suitable pilot burner it, which is sup-plied through a local line H, is providerl. The-line ll be connectedxto a main line and operate continously,"but is shown connected to .the liinefi at some convenient location so that introduced' to the pilotill for lighting when gas is admitted to thelowheat burnerl. Gas'is supjpliedto theburners from a common .mai'n supgas from the interior-30f the body intothe interior of the sleeve. Rotatably mounted within ."the sleeve it is a stop cock plug 1'], the plugljl being fitted-into the sleevein sealing relation -andheld .in placefor rotation about its axis by a suitable spring" I 9 and cooperating cap 2 0.

Theplug has an axialbore 2i and. radial ports 22 and 23 connected therewith and opening, attheir outer ends, .through'theface ofthe plug 11. The body I4 is provided with complementary ports 2 8 andflib which arepositioned for registry with the ports22 and .23.upon rotation of the plug ll to an open position, and areconnected to the 1ines9.and .8, respectively. The

(sleeve 1.6 alsohis provided with by-pass ductsfifi and 2'5. which. are controlled by. adjustableneedle valves 23 and 2.9,.respectivelmwhich are accessible for adjustmentfromthe outsideof the bodvand when opened admit fuel from-the interior of the body through the by-pass ducts 23 and 21, respectively. The plug ll also is provided with a pair of circumferential grooves 33 and 3|, the groove 36 communicating with the port 22 and the groove 3i communicating with the port 23. The grooves 30 and 3| are positioned axially of the plug so that the groove 33 can connect the by-pass duct 26 with the port 24 of the body when th plug is rotated to certain positions and the duct 3| is positioned axially of the plug so as to connect the by-pass duct 2? with the port 25 of the body in certain rotated positions of the plug.

In the heating of an oven, of a gas stove for example, it is desirable, in order to have efiicient burner operation, that a dual burner be provided in which the small burner can operate at or near capacity until suiiicient heat is required so that the gas to be supplied will be adequate in amount to permit efiicient operation of the larger burner. This is particularly true when initially starting the oven and before it has become heated. Accordingly, the groove 3| is made sufiiciently longer than the groove 30 and has its leading end in the direction of rotation positioned in advance of the leading end of the groove 33 a suiiicient distance so that upon rotation of the plug from a closed position, illustrated in Fig. 1, by-passed gas is first introduced to the burner i from the duct 27 and, upon rotation of the plug in the opening direction farther, by-pass gas is introduced to the burner 3 from the by-pass duct 26. The grooves 33 and 3i are sufficiently long so that at all times after the leading ends in the opening direction of rotation of the grooves 33 and 3| have reached their points of communication with the ports 24 and 25, respectively, the by-pass gas is continuously supplied to the burners. This supply is discontinued ony by rotating the plug to its off position illustrated in Fig. 1 in which neither of the grooves 30 and 3| and neither of the ports 22 and 23 are in registry with the ports 23 and 25, respectively. Thus the plug is operable and rotated from a closed to an open position first to admit a controlled and adjusted amount of gas to the burner l by way of the by-pass duct 2? and then upon further rotation to admit gas to the burner 3 by way of the lay-pass duct 28, thereafter continuing the introduction of limited amounts of gas to the burners through the respective bypasses until the plug is rotated in the opposite direction to closed position.

The main supply of gas to the burners is provided through the sleeve 13 and bore 2i of the stop cock. As illustrated, the sleeve 16 is open I at the end opposite from the plug i! and is provided with an annular seat 32. A suitable thermostatically controlled valve plug 33 cooperates with the seat 32 for admitting and stopping the flow of gas from the interior of the body through the interior of the sleeve and bore 2! of the stop cook. The valve 33 is normally held in seated condition by a spring 34, one end of which is seated against the plug and the other end of which is seated against the movable end of a thermostatic bellows 35. The bellows 35, in turn, is connected by a pipe 33 to the usual sealed expansible fluid vial 31 which, in response to heat, operates the bellows.

At the opposite side of the plug 33, an adjusting rod 38 is provided, the adjusting rod being mounted in a suitable spider 39 in and coaxial with the sleeve [6 and plug ll. The adjusting rod 33 is provided with a suitable ball end 40 which is snap fitted into a socket 4! in the valve i plug 33. The rod 38 is preferably of non-circular cross section and is supported by the spider 39 for movement axially and is constrained by the spider from rotational movement. At the opposite side of the spider from the ball H, the rod 38 is mounted for axial, but non-rotative movement, in a sleeve 43 and a suitable spring 43 is interposed between the end of the sleeve 42 opposite from the rod 38 and the end of the rod so as to urge the sleeve and rod relatively apart axially.

The plug ll carries a rod 44 which is coaxial and rotatable with the plug and rotatable relative to the sleeve 42 and in threaded engagement with the sleeve 52, as indicated at 45. The plug i! also is provided at the end opposite the sleeve 42 with a stem '36 which is rotatable with the plug. A suitable knob d? which has temperature indicia 38 about its periphery is fixedly secured to the end of the stem 53. Thus upon rotation of the knob 3'5, the stop cock plug I! is rotated and, the sleeve 32 being constrained from rotation with the rod 44 of the plug, travels along the thread at 35. The thread 25 is so arranged that upon rotation of the plug [1 toward open position, the sleeve is moved axially away from the stop cock and in a direction to compress the spring 43, thus applying to the plug 33 an unseating pressure in opposition to the seating pressure of the spring 35.

In Fig. 1 the plugs H and 3-3 are shown in closed position. In operation the spring 34 sufiiciently overbalances the spring so as to maintain the plug 33 in seated condition when the valve plug it is in closed position and to maintain it in seated position so that only the bypasses are effective for supplying gas when the plug IT is rotated for initially supplying gas to the low heat burner and thence initially to the high heat burners. Continued rotation of the plug it in the opening direction after by-pass gas has been admitted to both burners, applies suflicient compression on the spring 33 to overbalance the spring 34 and unseat the plug 33 after which time the burners are under the control of the thermostat. Additional rotation of the plug ll in the opening direction increases the compression of the spring 43 and creates a greater overbalance so that a higher temperature and expansion of the bellows is required to seat the plug 33 and limit the heat to the maximum heat set on the dial 48.

Thus in operation starting from the closed position of the plug ii, an adjusted amount of gas is admitted to the low heat burner l, the amount being sufiicient to maintain efi'icient combustion by a burner, the burner heating capacity being inadequate to cause high temperature in the oven. Additional rotation of the plug I l in the opening direction admits an adjusted amount of by-pass gas to the high burner 3, this amount being sufficient to maintain efficient combustion but insufficient to cause heats in the oven above What would be considered a normal low cooking heat. Additional rotation of the plug I! next opens the thermostatically controlled valve plug 33, admitting gas in addition to that supplied by the lay-passes. If the plug is rotated still farther, the unseating pressure is increased so that still higher temperatures must be reached before the plug 33 is closed by the bellows 35 Thereafter any higher range of temperatures is controlled by the thermostat. Thus by rotation of a single knob 33, the admission of gas to the burner for maintaining efficient cornbustion at various controlled temperatures is provided and a single thermostatic valve controls the temperature of a plurality of burners.

Referring next to Fig. 4, the device is shown installed on an oven 49 of a gas range, the oven having the usual air inlet and exhaust vents, not shown, and the dual burner being mounted in the oven in the usual fashion. The expansible fluid vial is located in the upper portion of the oven. In such an installation, the control device I3 may be mounted behind the usual front panel of the stove or in any other readily accessible place.

While the device has been shown as employing a bellows type expansible fluid thermostatic control, bi-metallic and other types of thermostats may be used.

I claim:

1. A burner and control combination for gas range ovens comprising a small oven heating burner adapted upon supplying a predetermined flow of fuel thereto to provide low heat in the oven at or near the rated efiiciency of the burner, a large burner adapted upon supplying a predetermined partial flow of fuel thereto to provide normal low cooking temperatures in the oven near the rated efficiency of the burner and upon supplying a predetermined larger amount of fuel thereto to provide high cooking heats in the oven at or near the rated efiiciency of the larger burner, a valve body adapted for connection to a source of gas and connected to each of the burners, a rotatable plug in the body for admitting and stopping the flow of fuel from the source to the burners, cooperative by-pass means in the plug and body for by-passing fuel to the burners, respectively, said by-pass means being rendered opera- 3 tive upon rotation of the plug from closed toward open position, but in advance of the open position, first to by-pass fuel to the smaller burner at said predetermined flow and then to by-pass fuel to the larger burner at said predetermined partial flow, a single normally closed adjustable thermostatic valve for admitting fuel to the burners and operable to connect the burners to the source of fuel independently of the by-pass means when the thermostatic valve is open, said thermostatic valve being operable accurately onl in the range of high cooking heats above that supplied by the larger burner when the larger burner is operating on said predetermined partial flow, said by-pass means continuing to be operative concurrently with the operation of said thermostatic valve means, and means operatively connecting said thermostatic valve and plug for unseating and adjusting the thermostatic valve in the said range of high cooking heats upon rotation of the plug toward open position beyond the position in which the by--pass means to the larger burner becomes operative to admit fuel to the larger burner.

2. The combination according to claim 1 further characterized in that said by-pass means continues to by-pass fuel to the small burner while the plug is in position to by-pass fuel to the larger burner.

VINCENT J. EVANS.

REFERENCE S CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,529,457 Wild Mar. 10, 1925 2,051,401 Winterstein Aug. 18, 1936 2,245,060 Waddell June 10, 1941 2,303,011 Weber Nov. 24, 1942 

